Head to head · Coding · updated Oct 25, 2026
LiteLLM vs Vercel AI SDK
LiteLLM scores 88 to Vercel AI SDK's 80 on public evidence for LLM APIs & model routers, and they rank #2 and #4 there. Both are free to start. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
LiteLLM
Open-source Python SDK and proxy that calls 100+ LLM providers through the OpenAI format.
+ Self-hosted gateway with spend tracking, virtual keys, and fallbacks across providers.
− Huge dependency surface and frequent releases that occasionally break provider mappings.
Vercel AI SDK
TypeScript toolkit for streaming LLM responses, tool calls, and agents across providers and UI frameworks.
+ Unified provider interface and React hooks make streaming chat UIs trivial.
− Major-version upgrades have required significant rewrites.
Side by side
public evidence| LiteLLM | Vercel AI SDK | |
|---|---|---|
| Evidence score / 100 | 88 | 80 |
| GitHub stars | 61,990 | 27,502 |
| Hacker News stories, 30d | 17 | 0 |
| Release-feed mentions, 30d | 1 | 0 |
| Last activity | 0 days ago | 0 days ago |
| Pricing | Open source · Free; enterprise proxy paid | Open source · Free; AI Gateway usage-based |
| Platforms | cli, api, linux | api, cli |
| Maker | BerriAI | Vercel |
Which one?
Pick LiteLLM if
- you want the stronger public evidence (88 vs 80)
- you need it on linux
Best for teams standardising LLM access behind one proxy.
Pick Vercel AI SDK if
Unified provider interface and React hooks make streaming chat UIs trivial.
Best for Next.js and React apps calling LLMs.